I had never heard of this tool until this morning, when I came across this article from Iron Oak Farm about what a froe is, and how the folks at Iron Oak Farm make them.
After reading the article, I want a froe. My strength and skill aren't really axe-worthy, so the fire wood chopping is always left to my husband.
I could see this splitter being supremely useful in making shingles, and I really prefer rough cut boards for building almost anything.
Check out How A Froe Is Made, by Iron Oak Farm via GRIT Magazine...